Convert old style website

https://lindatemple-harris.co.uk/

Hello, I have been asked to convert the old website above into a responsive website. I have set up a test site, read the gantry docs, seen the videos and understand the concept of 12/16 columns and the rows in the default gantry theme settings. It could be that I just need to spend more time practicing. But it could be that it is not possible to rebuild using Gantry. A bit of advice would be great. Thanks.

https://www.ads-software.com/extend/plugins/gantry-buddypress/